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This bug was originally marked as duplicate of bug 191206, that is already resolved. This bug is still valid, so this seems to be another bug, but it might be related. Build: NetBeans IDE 7.3 RC1 (Build 20130125-0fbf0f6115da) VM: Java HotSpot(TM) Client VM, 23.6-b04, Java(TM) SE Runtime Environment, 1.7.0_11-b21 OS: SunOS Stacktrace: java.lang.NullPointerException at org.netbeans.modules.form.layoutsupport.griddesigner.AnimationLayer.createContainerImage(AnimationLayer.java:185) at org.netbeans.modules.form.layoutsupport.griddesigner.AnimationLayer.animate(AnimationLayer.java:166) at org.netbeans.modules.form.layoutsupport.griddesigner.GlassPane$GridActionWrapper.actionPerformed(GlassPane.java:1499) at org.netbeans.modules.form.layoutsupport.griddesigner.GlassPane.performAction(GlassPane.java:1113) at org.netbeans.modules.form.layoutsupport.griddesigner.GlassPane.updateLayout(GlassPane.java:227) at org.netbeans.modules.form.layoutsupport.griddesigner.GridDesigner$7$1.run(GridDesigner.java:569)
Created attachment 130836 [details] stacktrace
This bug already has 5 duplicates see http://statistics.netbeans.org/exceptions/detail.do?id=198177
Created attachment 132814 [details] stacktrace changing insets of multiple selected object in the GridBag Customize layout dialog.
Created attachment 133768 [details] stacktrace Changed the insets of a component within an embedded GridBagLayout.
This bug already has 10 duplicates see http://statistics.netbeans.org/exceptions/detail.do?id=198177
Created attachment 133769 [details] screenshot showing embedded GridBagLayout
Created attachment 133770 [details] screenshot showing the component being adjusted When fourth number in the insets was changed, the error dialog appeared.
Created attachment 133796 [details] stacktrace Removed the border from a JPanel in the GridBagLayout editor.
Created attachment 133797 [details] stacktrace Exception dialog appeared when closing the GridBagLayout editor.
Created attachment 137352 [details] stacktrace Created a JFRame Set layout to GridbagLayout DnD a number of JLabel and JtextFields Opened the GridBag customizer multi-selected the text field by using the mouse (dragging the mouse around the textfields) Tried to move the selected field to a new cell
Looks like the fix of bug 191206 was later accidentally removed. http://hg.netbeans.org/jet-main/rev/35d007d5cd78